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CD22204 bảng dữ liệu(PDF) 4 Page - Intersil Corporation

tên linh kiện CD22204
Giải thích chi tiết về linh kiện  5V Low Power Subscriber DTMF Receiver
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nhà sản xuất  INTERSIL [Intersil Corporation]
Trang chủ  http://www.intersil.com/cda/home
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CD22204 bảng dữ liệu(HTML) 4 Page - Intersil Corporation

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Outputs D1, D2, D4, D8 and EN
Outputs D1, D2, D4, D8 are CMOS push-pull when enabled
(EN high) and open circuited (high impedance) when
disabled by pulling EN low. These digital outputs provide the
hexadecimal code corresponding to the detected digit. The
digital outputs become valid after a tone pair has been
detected and they are then cleared when a valid pause is
timed. The table below describes the hexadecimal codes.
DV
DV signals a detection by going high after a valid tone pair is
sensed and decoded at the output pins D1, D2, D4, and D8.
DV remains high until a valid pause occurs.
N/C Pin
This pin has no internal connection and should be left floating.
DTMF Dialing Matrix
Digital Inputs and Outputs
All digital inputs and outputs of the DTMF receivers are
represented by the schematic below. Only the “analog in” pin
is different, and is described above. Care must be exercised
not to exceed the voltage or current ratings on these pins as
listed in the “maximum ratings” section.
Input Filter
The CD22204 will tolerate total input noise of a maximum of
12dB below the lowest amplitude tone. For most telephone
applications, the combination of the high frequency
attenuation of the telephone line and internal band limiting
make special circuitry at the input to these receivers
unnecessary. However, noise near the 56kHz internal
sampling frequency will be aliased (folded back) into the
audio spectrum, so if excessive noise is present above
28kHz, the simple RC filter shown below may be used to
band limit the incoming signal. The cut off frequency is
3.9kHz.
TABLE 1. OUTPUT CODES
DIGIT
D8D4D2D1
10001
20010
30011
40100
50101
60110
70111
81000
91001
01010
*
1011
#1100
A
1101
B
1110
C
1111
D
0000
XEN
XEN
CD22204
10
9
6
11
ATB
XIN
3.579545MHz
VDD
XOUT
1M
10
11
6
XIN CONNECTED TO VDD
UP TO 10 DEVICES
CD22204
FIGURE 2. CRYSTAL OSCILLATOR
COL 0
1209Hz
COL 1
1336Hz
COL 2
1477Hz
COL 3
1633Hz
ROW 0
697Hz
ROW 1
770Hz
ROW 2
852Hz
ROW 3
941Hz
NOTE: Column 3 is for special applications and is not normally used
in telephone dialing.
1
2
3
A
4
5
6
B
7
8
9
C
*
0
#
D
VDD
VSS
CMOS
DIGITAL
CIRCUITRY
DIGITAL
OUTPUT
DIGITAL
INPUT
FIGURE 3. DIGITAL INPUTS AND OUTPUTS
CD22204
33k
0.0015
µF
270k
ANALOG
IN
NOISY
SIGNAL
FIGURE 4. FILTER FOR USE IN EXTREME HIGH
FREQUENCY INPUT NOISE ENVIRONMENT
CD22204


Số phần tương tự - CD22204_02

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
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Intersil Corporation
CD22204E INTERSIL-CD22204E Datasheet
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   5V Low Power Subscriber DTMF Receiver
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